EP1264674B1 - Horizontal injection moulding machine - Google Patents

Description

The invention relates to a horizontal injection molding machine according to the preamble of patent claim 1.

The prior art (US 4,330,257, EP 0 922 556 A1) discloses devices for holding and rotating molds or moldings in a horizontal injection molding machine in which a rotating block (tool center plate) which is displaceable in the machine longitudinal direction is provided as a mold carrier with a prismatic cross section between the mold clamping plates which is rotatably mounted about an axis perpendicular to the machine longitudinal axis. In order to move the rotary block on the one hand in the machine longitudinal axis and on the other hand to rotate about a perpendicular axis, a system is provided in which the rotary block is rotatably supported in carriers, said carrier at least at the two lower bars of the injection molding machine (US 4,330,257) or on all four bars (EP 0 922 556 AI) slidably guided and supported. In order for a precise guidance of the carrier or of the rotating block mounted thereon is possible, highly accurate and designed in close tolerances support and guide elements are required, which are systemically arranged at great distances from each other. Therefore, this support is sensitive to temperature variations, i. when cooled and concomitant shrinkage, the game in the camps is greater, while heating and a concomitant expansion there is a risk that the support and guide elements jam on the bars. To avoid the latter, the tolerances in the support and guide elements must not be too narrow, i. not to be interpreted too precisely. Another disadvantage is that the spars are loaded depending on the design of the rotary block and the carrier with a considerable weight (inadmissible deflection) and that the torques occurring during the rotation of the rotary block must be fully absorbed by the bars, which just when starting and braking the Rotary movement leads to considerable loads.

From US 3,838,961 a three-plate horizontal injection molding machine is known, which avoids the aforementioned disadvantages in that the rotary block is longitudinally displaceable on a Traverse is suspended, which is supported and fixed on the one hand on the fixed platen and the other on the support plate. In this way, the rotary block between the fixed platen and the movable platen and the spars of the three-plate horizontal injection molding machine are loaded with neither weight nor with torques. A disadvantage of this arrangement, on the one hand, that always two fixed plates are required, on which the traverse can be supported. Another disadvantage is that the overhead traverse and overhead rotary device only allows lateral access to the tool parts. Therefore, the tool parts must be installed and removed from the side, which is difficult, especially in heavy tool parts. The installation and removal of the entire tool as a unit would make it necessary to first dismantle the crosshead with the rotating device suspended thereon and to attach again after the tool installation.

Proceeding from this, the present invention seeks to provide a horizontal injection molding machine with a rotating device for injection molding, are at the spars unloaded and at the same time the installation and removal of the tools is simplified.

The solution of this object is achieved by a horizontal injection molding machine with the features of claim 1. Further developments can be found in the dependent claims 2 to 13.

An advantage of the invention is that the rotating device is completely detached from the bars and thus they are charged neither with weight nor with torques, and that in contrast to the aforementioned US 3,828,961 can be dispensed with a hindering tool change traverse. This has the advantage that the tool as a whole can be easily removed and installed, so that a complex adjustment of the individual tool parts can be omitted. In addition, since various linear guides are provided for the movable platen and the base plate, the rotating device can be designed as a module together with the linear guides of the base plate and this module can be used in almost every injection molding machine.

The H-shaped configuration of the base plate offers additional advantages, namely a stable support when the legs of the H are designed to be correspondingly long (dependent claim 10), as well as a slight removal of molded parts in the space between the legs of H (dependent claim 5). In the case of heavy tool center plates, it is advantageous to design the base plate so large that it extends to outside the region of the tool clamping plates (dependent claim 11). By means of transport straps and eyebolts, a complete floor mold can be lowered in the closed state in the area between the mold clamping plates and mounted on the turntable (dependent claim 7), wherein advantageously centering means are provided. The opening of the tool halves is advantageously supported by hydraulic pressure cylinders in the parting planes between the middle part of the tool and the stationary or the movable mold half (dependent claim 9).

Fig. 1:

Eine teilweise geschnittene Seitenansicht einer erfindungsgemäßen Spritzgießmaschine

Fig. 2:

System zur Bewegung der Dreheinrichtung in Maschinenlängsachse;

Fig.3:

schematische Darstellung des gesamten Werkzeugs mit Transportlaschen, Ringschrauben und Abdrückzylindern;

Fig. 4:

eine Draufsicht auf die Dreheinrichtung;

Fig. 5:

einen Schnitt entlang der Linie CD in Fig, 4, wobei die linke Hälfte die Ansicht in Richtung des Pfeiles A in Fig. 1 darstellt, während die rechte Hälfte die Ansicht in Richtung des Pfeils B in Fig. 1 darstellt;

Fig.6:

eine Draufsicht auf das Antriebssystem für den Drehteller:

Fig.7:

schematische Darstellung (in Seitenansicht) eines weiteren Verwendungszwecks für die Dreheinrichtung.

The invention will be explained in more detail with reference to an embodiment and with reference to Figures 1 to 7. Show it:

Fig. 1:

A partially sectioned side view of an injection molding machine according to the invention

Fig. 2:

System for moving the rotating device in the machine longitudinal axis;

Figure 3:

schematic representation of the entire tool with transport straps, eye bolts and Abdrückzylindern;

4:

a plan view of the rotator;

Fig. 5:

a section along the line CD in Figure 4, wherein the left half represents the view in the direction of arrow A in Figure 1, while the right half represents the view in the direction of arrow B in Figure 1 ..;

Figure 6:

a top view of the drive system for the turntable:

Figure 7:

schematic representation (in side view) of a further intended use for the rotating device.

The invention will be described in more detail with reference to a two-plate horizontal injection molding machine with a stack mold and a tool center plate, hereinafter referred to as a turning plate. In the injection molding machine 1 shown in FIGS. 1 to 6 are on a machine bed 2, a fixed platen 3 and a movable, guided on the machine bed guide 23, 24 and 25 and pulled to bars 5 to 8, platen 4 arranged. Between the platens a solid mold half 9, a movable mold half 10 and between them a turning plate 11 are provided. Between the solid mold half 9 and the side facing this turntable 11, the clock-1 floor is formed, while between the movable mold half 10 and the side facing this turntable 11, the clock-2 floor is provided. The clock 1 injection is carried out by one of the fixed tool half associated injection unit 12, while the clock 2 injection by an attached to the movable mold half 10 L-injection unit (not shown here) takes place. The insert 11 is mounted on a rotator 40 and that on a, generally rectangular, turntable 13 which is rotatably mounted on an H-shaped base plate 14. The legs of the H reach close to the tool platens, as can be seen in Fig. 1 for the rear legs 15 and 16. For heavy center plates additional guides can be provided on which the base plate is mounted and which can extend below the tool platens to outside of these. In this case, the legs of the H-shaped base plate are made wider or it is on one or both sides of the insert on the space between the legs of the H more or less strongly omitted and formed the base plate in this area throughout. One of the turntable 13 downwardly pointing pivot pin 19 (rotor) is rotatably mounted in a corresponding stator 20 and the base plate 14. The drive of the turntable by means of suitable drive means, for example by means of sprocket 43, pinion 44 and hydraulic or electric motor 49 (see Fig.5 and 6). The base plate 14 is mounted on stable linear guides 23 (or sliding guides) on the machine bed 2. For this purpose, the machine bed has stable linear rails or sliding guides 24 and 25, in which engages the correspondingly shaped underside of the base plate. According to the invention, different guides are to be provided for the base plate on the one hand and for the movable platen on the other hand. In the parting planes of the clock-1 -stage and the clock-2-level four hydraulic cylinders 28 to 35 are arranged symmetrically (see also Fig.3 and 5). These generate a parallel, concurrent, short stroke during the opening movement as additional support for a parallel approach of the tool. The longitudinal movement of the rotator 40 is effected by means of the Tool clamping plates on both sides of hinged racks or coarse thread spindles 36,37, and attached to the base plate gears 41 (see Fig.2). As can be seen from the plan view according to FIG. 4, finished molded parts can be ejected into the free space between the legs of the H and transported away from a conveyor belt (not shown here) arranged underneath. It thus eliminates additional handling systems for molding removal. By means of transport straps 39 and eyebolts 38 (see Figure 3) is an easy installation and removal of the entire tool as a unit possible. However, the tool parts can also be installed and removed separately if eye bolts 38 are present on each tool part and the transport straps 39 are released. For fixing the tool center plate on the turntable 13, one or more grooves and holes in the resting on the turntable part are provided in the lower region, so that fixing screws can be screwed through these holes in the turntable and the screw heads are accessible via the grooves. Preferably, not shown in the turntable centering means are provided to align the tool center plate clean.

On the rotating device, other elements can be mounted instead of a mold carrier of a stack tool. For example, as shown in FIG. 7, a holding frame 45, ie a so-called index frame or a so-called index plate, may be provided for a molding 46 to permit rotation of this molding 46 from a first stroke to a second stroke between the tool halves 9 and 10.

LIST OF REFERENCE NUMBERS

1

Horizontal injection

2

machine bed

3

fixed platen

4

movable platen

5-8

Holme

9

solid tool half

10

movable tool half

11

insert

12

first injection unit

13

turntable

14

H-shaped base plate

15.16

rear legs of the H-shaped base plate

17.18

front legs of the H-shaped base plate

19

pivot

20

stator

21.22

Ball or roller bearings

23

linear guides

24.25

rails

26.27

Cylinder for movement of the spars 6 and 8 (there are corresponding cylinders - not shown here for the spars 5 and 7)

28,29,30,31

bead breaker

32,33,34,35

bead breaker

36.37

Racks or coarse thread spindles

38

eyebolt

39

transport tab

40

rotator

41

gear

42

mounting screws

43

sprocket

44

pinion

45

Index frame or index plate

46

Injection molding (product)

47.48

mold halves

Claims (13)

1. Horizontal injection moulding machine comprising a fixed platen and a movable platen, columns extending between the platens, and a rotary device for injection moulds which is positioned between the platens, and may be displaced parallel to the longitudinal axis of the machine and is detached from the columns, characterised in that the rotary device comprises a base plate (14) which is mounted on the machine bed between the fixed platen and the movable platen, in that a turntable (13) which is mounted rotatably about a vertical axis is positioned on the top of the base plate (14), in that drive means (49) are provided for rotating the turntable (13) and in that a plurality of linear guides (23, 24, 25) are provided, different linear guides being provided for the base plate (14) on the one hand and for the movable platen (4) on the other hand.
2. Horizontal injection moulding machine according to claim 1, characterised in that to displace the rotary device, said rotary device is coupled to the two platens (3, 4) in such a way that when the movable platen (4) is moved, the rotary device is also moved, for example via gear racks (36, 37), spindles, in particular steep-lead-angle threaded spindles, or hydraulic cylinders.
3. Horizontal injection moulding machine according to claim 1, characterised in that the rotary device can be displaced parallel to the longitudinal axis of the machine, separately from the movable platen (4), for example by means of hydraulic cylinder units.
4. Horizontal injection moulding machine according to any one of claims 1 to 3, characterised in that the central part of a multi-daylight mould is fastened on the turntable, the central part being, for example, a central plate (11) or a prismatic mould carrier.
5. Horizontal injection moulding machine according to any one of claims 1 to 5, characterised in that the base plate (14) is configured substantially in an H-shape, and in that the transverse piece of the H-shaped base plate and the turntable are configured in such a way that moulded parts can fall down in the free space between the arms (15, 16, 17, 18) of the H.
6. Horizontal injection moulding machine according to either claim 4 or claim 5, characterised in that one or more ring bolts (38) are provided on the top of the central part (11) and/or of the fixed half (9) and/or the movable half (10) of the mould.
7. Horizontal injection moulding machine according to any one of claims 4 to 6, characterised in that one or more transport brackets (39) are provided over the complete upper surface of the mould, with which the parts of the mould may be held together and may be installed and removed as an entity.
8. Horizontal injection moulding machine according to any one of claims 1 to 7, characterised in that means are provided on the turntable (13) for holding moulded parts (49) produced between the fixed and the movable half of a mould (47, 48) fixed on the platens (3, 4), for example holding strips or holding frames (45).
9. Horizontal injection moulding machine according to any one of claims 1 to 8, characterised in that hydraulic pressure cylinders (28 to 35) are respectively provided in the region of the parting planes of mould halves, at least two, preferably four pressure cylinders being provided in each parting plane.
10. Horizontal injection moulding machine according to any one of claims 1 to 9, characterised in that the base plate (14) extends in the longitudinal direction of the machine to an extent such that when the mould is closed, only a small distance (safety distance) remains from each platen (3, 4) of the horizontal injection moulding machine.
11. Horizontal injection moulding machine according to any one of claims 1 to 10, characterised in that the base plate (14) is configured with such a length in the longitudinal direction of the machine that when the mould is closed, it reaches underneath the platens (3, 4) into the region outside the platens (3, 4).
12. Horizontal injection moulding machine according to any one of claims 1 to 11, characterised in that an electric or hydraulic motor is provided as a drive, with which a gear wheel engaging in a gear ring provided on the turntable can be driven.
13. Horizontal injection moulding machine according to any one of claims 1 to 12, characterised in that sliding guides are provided for the movable platen and/or for the base plate.

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